JSON Formatter & Validator
Format, beautify, minify and validate JSON with clear error messages. Instant, private, works offline.
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Runs entirely in your browser — nothing is uploaded
How to use the JSON Formatter & Validator
- 1
Paste your JSON
Or open a .json file.
- 2
Format or minify
Choose indentation, or strip all whitespace.
- 3
Copy or download
Errors show the exact line and column to fix.
Paste minified JSON from an API or log and make it readable, or minify it for a config file. Invalid JSON is flagged with the line and column of the problem.
Read the full guide with screenshotsFrequently asked questions
Is the JSON Formatter & Validator free?
Yes — completely free with no daily limit and no account. ZapMorph’s viewers and developer tools are unmetered.
Is what I type sent anywhere?
No. Everything runs in your browser with JavaScript. Nothing you enter is sent to our servers, which makes it safe for API keys, tokens and private data.
Does it work on my phone?
Yes. It works in any modern browser on iPhone, Android, Windows, Mac and Linux, with nothing to install.
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